Reducing valve for steam Yoshitake GDK-2000

Reducing valve for steam Yoshitake GDK2000
in stock
Price: specify




  • Manufacturer: Yoshitake (Japan)
  • Material: ductile iron, stainless steel
  • Action type: direct action
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  • Specifications
  • Description
  • Dimensions and weight
  • Chart
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Reduced Pressure Sensing MethodOuter impulse tube*
Inlet pressure0.1-2.0 MPa0.1-1.0 MPa
Reduced Pressure0.05-1.4 MPa0.05-0.85 MPa
Up to 85% of inlet pressure (gauge)
Air pressureSee pneumatic load pressure setting table
Min. differential pressure0.05 MPa
Max. coefficient pressure reduction10:1
Max temperature220 °C
Valve seat leaksNo more than 0.01% of nominal flow
MaterialBodyDuctile iron
ValveStainless steel
Valve seatStainless steel
MembraneStainless steel
Reduced pressure impulse tubeCopper pipe
ConnectionJIS Rc threaded connectionJIS 20K RF FlangeJIS 10K FF flange connection

Standard external impulse tube. When installing a pressure reducing valve, be sure to attach the impulse tube and compensator as a set. If the impulse piping is not connected, the valve will not work.

*Available with ASME or EN flanges.

Direct acting valve of simple design. The best choice for pressure control in branch lines and in front of small equipment.

  1. In a direct acting valve, there are fewer active parts, the design is simple but strong.
  2. Spherical main valve provides good sealing and reduced valve seat leakage (ANSI Class IV).
  3. Large sized diaphragm for high Cv and ability to control load changes.
  4. Easy pressure adjustment thanks to remote control; wide range of pressure settings.
Nom. sizedLH1HAWeight
15ARc 1/21507424420012.4
20ARc 3/41507424420012.4
25ARc 11607625122616.4
32ARc 1-1/41809028222619.9
40ARc 1-1/21809028222619.9
50ARc 223010331927630.5

*  NPT connection options available.

diagram with Yoshitake GDK-2000 threaded connection

Nom. sizeLH1HAWeight
15A146 (142)7424420013.9 (13.7)
20A146 (142)7424420014.4 (14.2)
25A156 (152)7625122619.2 (18.8)
32A176 (172)9028222622.4 (22.0)
40A196 (192)9028222622.9 (22.5)
50A222 (218)10331927633.5 (33.5)
65A282 (278)12237335261.8 (61.5)
80A302 (294)13539935269.1 (66.9)
100A342 (330)167488401108.6 (105.0)

* The above values in brackets are JIS 10K FF flange dimensions and weights.

* Contact us for other specifications.

diagram with Yoshitake GDK-2000 flange connection

GDK-2000 Specification Selection Chart

GDK-2000 specification selection chart

See Refer to the selection chart above to select the most suitable pressure reducing valve option. Find the point of intersection between the inlet pressure (P1) and the reduced pressure (P2). If the crossover point is within range (A), the pressure reduction should be carried out in two steps. If within the range (B) - the control range. If within range (C), maximum performance cannot be achieved. When depressurizing in two stages, the distance between the valves must be at least 3 m.

Sizing Chart for GP-2000 Series (Steam, External Impulse Tube)

Sizing chart for GP-2000 series (for steam, external impulse tube)

When sizing a pressure reducing valve at inlet pressure (P1), reduced pressure (P2) and flow rate of 0.6 MPa, 0.4 MPa and 600 kg/h, respectively, first find the intersection point (a) of the pressure lines at the inlet 0.6 MPa and reduced pressure 0.4 MPa. From this point, draw a line downward until it intersects with the line corresponding to a flow rate of 600 kg/h — intersection point (b). Since the point of intersection (b) lies between the dimensions 20A and 25A, it is necessary to choose the larger of the two — 25A.
*The margin factor should be taken equal to 80-90%.

Flow curve

 Yoshitake GDK-2000 flow characteristics graph

When selecting a nominal size, set the flow rate to 80-90% of the design flow so that the pressure loss and temperature loss of the shut-off valve, filter, etc., before or after the pressure reducing valve can be used. In order for the pressure reducing valve to exhibit maximum flow characteristics, do not select a small diameter pipeline as a countermeasure against the influence of resistance in the pipe. Select a nominal size based on the nominal size selection chart.

GDK-2000 pressure curve

GDK-2000 Pressure Characteristic Graph

This graph shows the underpressure change when the 1.4MPa valve inlet pressure starts to fluctuate between 0.2MPa and 1.4MPa, while the underpressure pressure is set at 0.14 MPa.

GDK-2000 Pneumatic Load Pressure Setting Table

GDK pneumatic load pressure setting table -2000

How to read a table (GDK-2000)
If the nominal size — 25A, inlet pressure (P1) — 1.0 MPa, and reduced pressure (P2) — 0.2 MPa, the pneumatic load pressure is calculated as follows: draw a line upwards from the differential pressure point (Delta;P) before and after the pressure reducing valve (1.0 MPa — 0.2 MPa = 0.8 MPa) to find point of intersection (a) with nominal size 25A. Calculate ΔPa (pneumatic load pressure (Pa) - set pressure (P2)) = 0.037 MPa by drawing a horizontal line to the left of the intersection point (a). Thus, the pneumatic load pressure is: (Pa) = .Delta;Pa + P2 = 0.037 + 0.2 = 0.237 MPa.


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Reducing valve for steam Yoshitake GDK2000

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